This is a quick, healthy and tasty side dish for chicken and steak dishes.
In a large skillet, heat oil over medium. Add garlic; cook, stirring, until fragrant and beginning to brown, about 1 minute. Using a slotted spoon, remove garlic and discard.
Raise heat to high. Add spinach to skillet gradually, waiting for one batch to wilt before adding the next. Cook, tossing, until tender, 3 to 4 minutes.
Drain liquid from skillet; add lemon juice, salt, and pepper to taste.
Spinach loses about three-quarters of its volume when cooked, so be mindful of the quantity called for in recipes, even if it seems like a lot.